Hi there again. I have some issues opening some complex (with a lot of features, many of them surface generated solids)models. Whenever i try to open the models, programm shut off. Sometimes (and this saved me a lot of times) i can open a Geometry Representation of the models, and only then i can change the representation to Master, so i can continue working on the model. Sometimes i could open the models by using them as a Reference model in a new NC machinist file, and once model is loaded, by doing RMB "open Base" the model opens corrrectly in Master representation. BUt sometimes i have models that i could open back again in Master, so i can´t do anything with it. Did anybody have the same problem? How did you solve it? Thanks a lot!